Strainer



- W. S. ELLIOTT.

STRAINER. APPLICATION FILED OCT-31,1918.

. 1,380, 1 14. Patented y 31, 1921.

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UNITED stares WILLIAM S. ELLIOTT, OF PITTSBURGH, PENNSYLVANIA.

STRAINER.

Specification of Letters Patent.

Patented May 31, 1921.

Applicationfiled October 31, 1918. Serial No. 260,457. 7

To all whom it may concern:

Be it known that I, WiLLiAM S. ELLIOTT, a citizen of the United States,residing at Pittsbur h, in the county of Allegheny and Potato ofPennsylvania, have invented a new and useful Improvement in Strainers,of

which the following is a full, clear, and exact description, referencebeing had to the accompanying drawings, forming part of thisspecification, in which- Figure 1. is an end elevation of a strainerembodying my invention.

Fig. 2 is the same partly in side elevation and partly in verticalsection, and

3 is a section on the line Ill-1H of Fig. 2.

My invention has relation to strainers for use in water supply orcirculating systems and is designed to provide a strainer of the typehaving removable strainer elements with means of simple and effectivecharacter for preventing dirt and the like being carried back into thesupply side of the system while the normal operation of the strainer isinterrupted for the purpose of removing and cleaning the elements. Myinvention also provides a strainer of this type with means whereby theforegoing result may obtained without entirely preventing the flow ofwater through the strainer. It also provides ,means whereby dirt or thelike is prevented from being carried through the strainer system intothe pipe line while the strainer elements are removed.

The nature of my invention will be best understood by reference to theaccompanying drawings in which I have shown a preferred. embodimentthereof and which will now be described, it being premised, however,that various changes can be made in the details of construction,arrangement and combination of the various parts without departing fromthe spirit and scope of my invention as defined in the appended claims.

In these drawings, the numeral 2 desigates the casing of the strainerproper, 3 an inlet connection secured to one end of the casing 2, and 4an outlet connection secured to the opposite end of the casing 2. WhileI have shown the parts 2, 3 and 4 as separately constructed, I do notlimit myself to this feature since, especially for smaller sizes, it isobvious that these three parts might be cast in a single piece.

The casing 2 is formed at one side with removable doors 5 to permitaccess to the strainer chamber 6, which are secured in place by anydetachable fastenings such as the bars .7. 8 designates strainerelements which are removably supported in any suitable inanner withinthe chamber 6, and which may be of any desired type. In the constructionshown, t iese elements are in the form of cylindrical baskets ofperforated sheet metal whose supporting frames 9 are slidably mounted inguides 10 on the interior of the casing. WVhen tne doors 5 are removedthe baskets can be readily taken out through the door openings forcleaning and the like.

11 designates two oppositely located guard plates which are secured tothe shafts 12 journaled in the inlet end portion of the casing 2. Theseguards consist of a suitable frame to which are secured a perforatedmetal plate 13. lVhen the guards are in openposition, as shown in fulllines in Fig. they are within lateral offset portions of the inletpassage, and out of the path of the flow of water through such passage.By actuating the shafts 12, these guards may be swung downwardly to thepositions indicated in dotted lines in Fig. 3 whereby they extend acrossthe entire inlet passage adjacent to the inlet ends of the strainerelements.

In the operation of strainers of this general type, when it is desiredto remove the strainer elements, the normal flow of water through thestrainer isinterrupted either by stopping the pump which supplies thesystem and which is connected to the inlet end of the strainer; bybreaking vacu um by opening the doors or by valve means located betweenthe supply and strainer. WVhen this occurs it is desirable to preventdirt and the like from being carried from the strainer chamber back intothe supply pipe by the reverse flow or eddy which is apt to then occur.While the has kets are removed it is also desirable to prevent dirt orforeign material from being carried through the strainer chamber. It isfor these purposes that the guards 11 are provided. When in their closedpositions, they effectively guard against the passage of dirt and thelike either from the supply line into and through the strainer chamberor from the strainer chamber back into the supply line. At the same timethe perforations in the guards are of sufficient capacity so that theflow of water is not entirely interrupted.

The shafts 12 may be actuated in any suitable or convenient manner. Inthe construction shown I have provided the shaft 14 journaled at theouter side of the casing 2 at one end and carrying two worms 15 whichmesh respectively with the teeth of the segments 16, which are fastened-to the rojecting end portions of the shafts 12. The shaft 14- isprovided at one end with a hand wheel 17.

It will be understood that the guards provided by my invention areentirely independent of and additional to any valves which may beprovided for controlling the flow through the strainer.

The advantages of my invention will be apparent from the foregoing. Theguards are entirely within the strainer structure in both their open andclosed positions; they in no way interfere with the normal flow throughthe strainer, and can be quickly moved into and out of their operativepositions.

I claim:

1. A strainer apparatus comprising a strainer chamber having a singleflow entrance passage, a strainer element removably seated in saidchamber, and a perforated guard device normally supported in a positionoutside the line of flow through said flow passage and arranged to bemoved across said passage in series with the strainer element,substantially as described.

2. A strainer comprising a casing having a strainer chamber, an inletconnection and an outlet connection, a plurality of strainer elementsremovably seated in said chamber and pivoted guard members arranged tobe moved into and out of position across the inlet passage adjacent tothe strainer elements and normally supported in a position outside ofthe line of flow through said chamber, substantially as described.

3. A strainer comprising a casing hav ing a strainer chamber, an inletconnection and an outlet connection, a strainer element removably seatedin. said chamber, and pivoted guard members arranged to be moved intoand out of position across the inlet passage to said chamber, said.guard members having perforations therethrough and normally supported ina position outside of the line of flow through said. passage,substantially as described.

4:. A strainer comprising a strainer chamber having inlet and outletconnections, a strainer element seated in said chamber, a perforatedguard member normally con tained within the inlet connection and movableto a position across the inlet end of said element, said guard memberbeing normally supported in a position outside of the line of flowthrough said connection, substantially as described. 7

5. A strainer, comprisin a casing having a strainer chamber and an inletconnection, said inlet connection having its inlet passage provided withlaterally offset portions, and pivoted guard devices normally lyingwithin said offset portions and outside of the line of flow through saidconnection and movable downwardly across said passage, substantially asdescribed.

6. A strainer, comprising a casing having a strainer chamber and aninlet connection, said inlet connection having its inlet passageprovided with laterally offset portions, and pivoted guard devicesnormally lying within said offset portions and normally out-side of theline of flow through said connection and movable downwardly across saidpassage, together with means for simultaneously actuating said members,substantially as described.

In testimony whereof, I have hereunto set my hand.

WILLIAM s. ELLIOTT.

